參數(shù)資料
型號: ST6397
廠商: 意法半導(dǎo)體
英文描述: 8-BIT HCMOS MCUs FOR TV FREQUENCY SYNTHESIS WITH OSD
中文描述: 8位微控制器HCMOS電視頻率合成帶OSD
文件頁數(shù): 31/68頁
文件大?。?/td> 560K
代理商: ST6397
Figure30. I/OConfiguration Diagram
(Open Drain 12V)
Figure31. I/OConfiguration Diagram (Open Drain 5V, Push-pull)
Input/Output Configurations
The following schematics show the I/Olines hard-
ware configurationfor the different options. Figure
30 shows the I/O configuration for an I/O pin with
open-drain 12Vcapability(standarddrive and high
drive). Figure31showsthe I/Oconfiguration foran
I/Opinwithpush-pull andwith open drain5V capa-
bility.
Notes :
The WAIT instruction allows the ST639x to be
used insituationswhere low power consumptionis
needed. This can only be achievedhowever if the
I/Opins either are programmed as inputs with well
defined logic levels or have no power consuming
resistive loads in output mode.As the same die is
used forthe differentST639xversions theunavail-
able I/Olines of ST639x should be programmed in
output mode.
Single-bit operations on I/Oregisters are possible
but
care is necessary
because reading in input
mode is made from I/O pins while writing will di-
rectlyaffectthe Portdataregister causingan unde-
sired changes of the input configuration.
INPUT/OUTPUT PORTS
(Continued)
ST6391,92,93,95,97,99
27/64
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